read the following excerpt from "the outcasts of poker flat" that describes the outcasts' retreat from town.
"as the escort disappeared, their pent-up feelings found vent in a few hysterical tears from the duchess, some bad language from mother shipton, and a parthian volley of expletives from uncle billy. the philosophic oakhurst alone remained silent."

"the outcasts of poker flat" by bret hart, 1869

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what does the allusion parthian tell the reader about uncle billy?
a. it clarifies where he is going.
b. it compares him to the city of parthia.
c. it emphasizes his belligerent personality.
d. it refers to the arrows he shoots at his escorts.